The photocatalytic performance and preparation of anatase TiO_2 microspheres with high crystallinity

In order to prepare high-performance photo catalyst,anatase TiO2 microspheres with high crystallinity were synthesized through hydrothermal method,via titanyl sulfate as inorganic precursor.The obtained TiO2 microspheres were characterized in detail by XRD,Raman and SEM.Experimental results indicated that TiO2 microspheres after being calcined at 700 ℃(T700) still possessed anatase crystalline structure.The diameters were about 10 μm.The rutile phase was present when the calcination temperature was up to 800 ℃.The photocatalytic degradation of highly toxic 2,4-dichlorophenol indicated that T700 possessed the highest photocatalytic activity,up to 99.5%,which was attributed to its high crystallinity,reduced the surface defects,thus favored the separation of photo-generated electron-hole pairs.